Density And Yield Of Plastic Concrete

Question 1

The maximum specified slump at which vibration is usually used is blank

Answer 1

40 mm

Question 2

When calculating the volume of the measure for calibration purposes, it is to be filled with water between blank and blank

Answer 2

20 / 25

Question 3

The balance or scale used to perform a density test must be sensitive to within blank

Answer 3

0.05 kg

Question 4

If riding is used as the method of consolidation, the measure must be filled in blank layers

Answer 4

3

Question 5

For 7 L measure required number of strokes of the tamping rod for consolidation of each layer is black

Answer 5

25

Question 6

Concrete produced using 40 mm nominal maximum size course aggregate with no aggregate retained on the 40 mm sieve may be tested using the 7 L bowl.

Answer 6

True

Question 7

For the top two layers, the tapping rod chop, penetrate about blank into the underlying layer

Answer 7

25 mm

Question 8

If vibration is used as the method of consolidation, the measure must be filled in blank layers

Answer 8

Two

Question 9

On completion of consolidation, what should be done to correct a deficiency if the concrete layer is slightly below the top of the measure

Answer 9

Add a small quantity of concrete

Question 10

What tools are required to perform
1. Initial strike off
2. Intermediate strike off
3. Final Strike off

Answer 10

1. Tamping rod or Strike off bar
2. Strike off Plate
3. Strike off Plate

Question 11

After completing the strike off procedure what must be done prior to obtaining the gross mass

Answer 11

Clean off all excess concrete

Question 12

Mass measurements Shelby determined to the nearest blank

Answer 12

0.05 kg

Question 13

Density of concrete should be recorded to what accuracy

Answer 13

1 kg/m3